Bubble Situation

[GtrHtr]

I had this situation come up on the bubble last night on UB. UTG has been the table LAG but not a maniac. His stack size has gone up and down in 1000 chip movements. I have been playing TAG but getting very good cards so playing in more hands than I normally will play in the early levels. I've been HU with UTG once on level 4 (60/30) where he slow played a flopped set to my TPTK. I have had to try to recreate the hand - didn't save the HH at the time so no converter, sorry if it is a mess.

Blinds: 200/100

SB (t2400)
BB (t4150)
UTG (t4200)
Hero (t4250)

Preflop: Hero is on the Button with A [img]/images/graemlins/spade.gif[/img], K [img]/images/graemlins/spade.gif[/img].
UTG calls, Hero raises 700, 2 folds, UTG raises all-in.
Hero?